Scientists heavily rely on ___(artifacts)___ to learn about early American Indians.
Early urban areas in North America tended to develop along ____(rivers)___ .
The majority of jobs in Canada are found in ___ (the service sector)___.
The Canadian government differs from the US government in that of ___(in Canada the head of government is not elected by the people)____.
In 1803, the ___(Louisiana Purchase)___ doubled the size of the United States.
A potlatch is ___(social gathering)___ .
The ___(British North American Act)___ established independence for Canada.
The ___(British)___ established the Jamestown colony.
A major environmental issue facing the US and Canada are ___(climate change)___ .